<!DOCTYPE html>
<html>
<head>
    <title>details和summary使用</title>
    <style type="text/css">
        body{
            padding: 5px;
            font-size:12px;
        }
        summary{
            font-weight:bold;
        }
    </style>
</head>
<body>
<details open="open">
    <summary>页面说明</summary>
    本页面创建于2017/3/20
</details>

</body>
</html>